#login{
    height: 100%;
    background-image: url("../../assets/img/login-bg.jpg");
    background-size: 100% 100%;
}
.demo-ruleForm{
    width: 400px;
    height: 200px;
    background-color: rgba(205,205,205,.5);
    padding: 50px 30px 10px 10px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform:translate(-50%,-50%);
}